Open AccessStress-strain model for prestressing steel with cyclic loading
Author(s) -
Kevin J. Thompson,
R. Park
Publication year - 1978
Publication title -
bulletin of the new zealand society for earthquake engineering/nzsee quarterly bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.917
H-Index - 36
eISSN - 2324-1543
pISSN - 1174-9857
DOI - 10.5459/bnzsee.11.4.209-218
Subject(s) - materials science , envelope (radar) , monotonic function , structural engineering , strain (injury) , stress (linguistics) , ultimate tensile strength , stress–strain curve , composite material , constant (computer programming) , function (biology) , range (aeronautics) , deformation (meteorology) , mathematics , mathematical analysis , engineering , computer science , medicine , telecommunications , radar , linguistics , philosophy , evolutionary biology , biology , programming language
Experimental stress-strain curves for repeated tensile loading of
0.276 in (7 mm) diameter prestressing steel wire in the inelastic range
are presented. A mathematical model employing a modified form of the Ramberg-Osgood function is proposed to describe the cyclic stress-strain behaviour of the prestressing steel. The experimental stress-strain
results are subjected to regression analysis in order to obtain empirical expressions for the constants in the Ramberg-Osgood function. The constants are found to depend on the strain imposed in the previous loading run and the characteristics of the monotonic stress-strain curve. The stress- strain curve for monotonic loading, with suitably adjusted origin of coordinates in the case of significant reversed loads, is used to describe the envelope curve which the steel stresses cannot exceed. The proposed cyclic stress-strain model predicted the experimental curves with good accuracy.